This is more or less what control Sajj looks like. There’s lots of variations but it’s all very similar in it’s core. Point is how despite you being a control deck, you don’t want to commit to the cause too much because it will hurt you more than it will help you as you will keep getting bad hands. That would be fine if the deck had a very clear wincon but it doesn’t.
When it comes to zirix, the idea is similar. But if you decide to go the devrish route maybe it’s best to stick with midrage instead as they’re all about pressure with obelysks rather than actual control. Even though I’m sure it shouldn’t be too hard to incorporate some dervish synergy in form of dunecasters and rashas in the deck.
When it comes to specific cards you asked about, I don’t even remember seeing Paragon once since the expansion. People seem to be focusing on reliable removals instead. But Iunno, it’s worth giving a shot. CoD is a very tricky card. It’s only really amazing when you can follow it up with Domwill to regain the advantage after spending all your mana clearing the board. Otherwise you are still in the losing position, just not in such a big one. Sometimes that might be enough to win you the game but sometimes it won’t and when it comes to control I don’t want any uncertainties there. But hey, I believe it’s also worth trying out.